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Behavior of Sound in a Room
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absorbing material absorption coefficient Acous acoustic conditions acoustical treatment air space Amer amplifying approximately Architectural Acoustics arrangement ARTICULATION TESTS audi audience auditorium average buildings Calculate ceiling cent CHAPTER Chautauqua Auditorium curved walls cycles per second cycles/sec decibels Diagram showing diffraction direct sound distribution of sound disturbance dome echoes effect equation example Eyring equation Figure floor frequency give hairfelt hear installation intensity level Jour Knudsen listening loud-speaker loudness machine mean free path noise level normal modes objectionable optimal partition Philadelphia Orchestra phons plaster Potwin problem quiet rarefactions rear walls reduced reduction factor reflected sound reflection of sound resonant reverberation sabins shown in Fig side walls sound insulation sound level sound reflected sound waves sound-absorbing materials sound-amplifying system soundproof speaker speech stage standing waves Table tion tone torium transmission transmitted usually velocity of sound ventilation vibrations volume wood